Try cleaning the small contacts in the MAF sensor with MAF sensor cleaner do not use carb or brake cleaner. also did they use a Delco cap and rotor? I had problems with my 2000 until I replaced the cheap equipment with Delco. Good luck I hope this helpsTry cleaning the small contacts in the MAF sensor with MAF sensor cleaner do not use carb or brake cleaner. also did they use a Delco cap and rotor? I had problems with my 2000 until I replaced the cheap equipment with Delco. Good luck I hope this helps

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Gm has a tecnical service bulleten out it affects all astro s and blazer s remove distrbuter cap and rotor clean out breather holes in base of dist 2 total replace with new cap and rotor 70dollars for both moisture builds up in dist cap causing the problem.

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